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Woodington BJ, Lei J, Carnicer-Lombarte A, Güemes-González A, Naegele TE, Hilton S, El-Hadwe S, Trivedi RA, Malliaras GG, Barone DG. Flexible circumferential bioelectronics to enable 360-degree recording and stimulation of the spinal cord. Sci Adv 2024; 10:eadl1230. [PMID: 38718109 PMCID: PMC11078185 DOI: 10.1126/sciadv.adl1230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 04/04/2024] [Indexed: 05/12/2024]
Abstract
The spinal cord is crucial for transmitting motor and sensory information between the brain and peripheral systems. Spinal cord injuries can lead to severe consequences, including paralysis and autonomic dysfunction. We introduce thin-film, flexible electronics for circumferential interfacing with the spinal cord. This method enables simultaneous recording and stimulation of dorsal, lateral, and ventral tracts with a single device. Our findings include successful motor and sensory signal capture and elicitation in anesthetized rats, a proof-of-concept closed-loop system for bridging complete spinal cord injuries, and device safety verification in freely moving rodents. Moreover, we demonstrate potential for human application through a cadaver model. This method sees a clear route to the clinic by using materials and surgical practices that mitigate risk during implantation and preserve cord integrity.
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Affiliation(s)
- Ben J. Woodington
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK
| | - Jiang Lei
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | | | - Amparo Güemes-González
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK
| | - Tobias E. Naegele
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK
| | - Sam Hilton
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK
| | - Salim El-Hadwe
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Rikin A. Trivedi
- Division of Neurosurgery, Addenbrookes Hospital, Hills Road, Cambridge, UK
| | - George G. Malliaras
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK
| | - Damiano G. Barone
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK
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2
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Joannides AJ, Korhonen TK, Clark D, Gnanakumar S, Venturini S, Mohan M, Bashford T, Baticulon R, Bhagavatula ID, Esene I, Fernández-Méndez R, Figaji A, Gupta D, Khan T, Laeke T, Martin M, Menon D, Paiva W, Park KB, Pattisapu JV, Rubiano AM, Sekhar V, Shabani HK, Sichizya K, Solla D, Tirsit A, Tripathi M, Turner C, Depreitere B, Iaccarino C, Lippa L, Reisner A, Rosseau G, Servadei F, Trivedi RA, Waran V, Kolias A, Hutchinson P. Consensus-Based Development of a Global Registry for Traumatic Brain Injury: Establishment, Protocol, and Implementation. Neurosurgery 2024; 94:278-288. [PMID: 37747225 DOI: 10.1227/neu.0000000000002661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 07/05/2023] [Indexed: 09/26/2023] Open
Abstract
BACKGROUND AND OBJECTIVES Global disparity exists in the demographics, pathology, management, and outcomes of surgically treated traumatic brain injury (TBI). However, the factors underlying these differences, including intervention effectiveness, remain unclear. Establishing a more accurate global picture of the burden of TBI represents a challenging task requiring systematic and ongoing data collection of patients with TBI across all management modalities. The objective of this study was to establish a global registry that would enable local service benchmarking against a global standard, identification of unmet need in TBI management, and its evidence-based prioritization in policymaking. METHODS The registry was developed in an iterative consensus-based manner by a panel of neurotrauma professionals. Proposed registry objectives, structure, and data points were established in 2 international multidisciplinary neurotrauma meetings, after which a survey consisting of the same data points was circulated within the global neurotrauma community. The survey results were disseminated in a final meeting to reach a consensus on the most pertinent registry variables. RESULTS A total of 156 professionals from 53 countries, including both high-income countries and low- and middle-income countries, responded to the survey. The final consensus-based registry includes patients with TBI who required neurosurgical admission, a neurosurgical procedure, or a critical care admission. The data set comprised clinically pertinent information on demographics, injury characteristics, imaging, treatments, and short-term outcomes. Based on the consensus, the Global Epidemiology and Outcomes following Traumatic Brain Injury (GEO-TBI) registry was established. CONCLUSION The GEO-TBI registry will enable high-quality data collection, clinical auditing, and research activity, and it is supported by the World Federation of Neurosurgical Societies and the National Institute of Health Research Global Health Program. The GEO-TBI registry ( https://geotbi.org ) is now open for participant site recruitment. Any center involved in TBI management is welcome to join the collaboration to access the registry.
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Affiliation(s)
- Alexis J Joannides
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
| | - Tommi K Korhonen
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
- Neurocenter, Neurosurgery, Oulu University Hospital & University of Oulu, Oulu , Finland
| | - David Clark
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
| | - Sujit Gnanakumar
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
| | - Sara Venturini
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
| | - Midhun Mohan
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
| | - Thomas Bashford
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
- Division of Anaesthesia, Department of Medicine, University of Cambridge & Cambridge University Hospitals NHS Foundation Trust, Cambridge , Cambridgeshire , UK
- Health Systems Design Group, Department of Engineering, University of Cambridge, Cambridge , UK
| | - Ronnie Baticulon
- Division of Neurosurgery, Department of Neurosciences, Philippine General Hospital & University of the Philippines Manila, Manila , Philippines
| | - Indira Devi Bhagavatula
- Department of Neurosurgery, National Institute of Mental Health and Neuro Sciences, NIMHANS, Bengaluru , Karnataka , India
| | - Ignatius Esene
- Division of Neurosurgery, Faculty of Health Sciences, The University of Bamenda, Bambili , Cameroon
| | - Rocío Fernández-Méndez
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
| | - Anthony Figaji
- Division of Neurosurgery, Neurosciences Institute, University of Cape Town, Cape Town , South Africa
| | - Deepak Gupta
- Department of Neurosurgery, All India Institute of Medical Sciences, New Delhi , India
| | - Tariq Khan
- Department of Neurosurgery, North Western General and Research Hospital, Peshawar , Pakistan
| | - Tsegazeab Laeke
- Division of Neurosurgery, Department of Surgery, College of Health Sciences, Addis Ababa University, Addis Ababa , Ethiopia
| | - Michael Martin
- Orion MedTech Ltd. CIC, Cambridge , Cambridgeshire , UK
- Obex Technologies Ltd., Cambridge , Cambridgeshire , UK
| | - David Menon
- Division of Anaesthesia, Department of Medicine, University of Cambridge & Cambridge University Hospitals NHS Foundation Trust, Cambridge , Cambridgeshire , UK
| | - Wellingson Paiva
- Division of Neurosurgery, Department of Neurology, School of Medicine, University of São Paulo, São Paulo , Brazil
| | - Kee B Park
- Department of Global Health and Social Medicine, Global Neurosurgery Initiative-Program in Global Surgery and Social Change, Harvard Medical School, Boston , Massachusetts , USA
| | - Jogi V Pattisapu
- University of Central Florida College of Medicine, Orlando , Florida , USA
- Department of Neurosurgery, King George Hospital, Visakhapatnam , Andhra Pradesh , India
| | - Andres M Rubiano
- Neurosciences Institute, El Bosque University, Bogotá , Colombia
| | - Vijaya Sekhar
- Department of Neurosurgery, King George Hospital, Visakhapatnam , Andhra Pradesh , India
- Current Affiliation: Department of Neurosurgery, Government General Hospital & Rangaraya Medical College, Kakinada , Andhra Pradesh , India
| | - Hamisi K Shabani
- Department of Neurosurgery, Muhimbili Orthopaedic Institute, Dar es Salaam , Tanzania
| | - Kachinga Sichizya
- Department of Neurosurgery, University Teaching Hospital, Lusaka , Zambia
| | - Davi Solla
- Division of Neurosurgery, Department of Neurology, School of Medicine, University of São Paulo, São Paulo , Brazil
| | - Abenezer Tirsit
- Division of Neurosurgery, Department of Surgery, College of Health Sciences, Addis Ababa University, Addis Ababa , Ethiopia
| | - Manjul Tripathi
- Department of Neurosurgery, Postgraduate Institute of Medical Education and Research, Chandigarh , India
| | - Carole Turner
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
| | | | - Corrado Iaccarino
- Department of Biomedical, Metabolic and Neural Sciences, School of Neurosurgery, University of Modena and Reggio Emilia, Modena , Italy
- Division of Neurosurgery, University Hospital of Modena, Modena , Italy
- Emergency Neurosurgery Unit, AUSL RE IRCCS, Reggio Emilia , Italy
| | - Laura Lippa
- Department of Neurosurgery, Ospedale Niguarda, Milan , Italy
| | - Andrew Reisner
- Departments of Neurosurgery and Pediatrics, Children's Healthcare of Atlanta & Emory University School of Medicine, Atlanta , Georgia , USA
| | - Gail Rosseau
- Barrow Global, Barrow Neurological Institute, Phoenix , Arizona , USA
- Department of Neurosurgery, George Washington University School of Medicine and Health Sciences, Washington , District of Columbia , USA
| | - Franco Servadei
- Humanitas Research Hospital-IRCCS & Humanitas University, Rozzano, Milan , Italy
| | - Rikin A Trivedi
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
| | - Vicknes Waran
- Division of Neurosurgery, Department of Surgery, Faculty of Medicine, University of Malaya, Kuala Lumpur , Malaysia
| | - Angelos Kolias
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
| | - Peter Hutchinson
- NIHR Global Health Research Group on Acquired Brain and Spine Injury, University of Cambridge, Cambridge , Cambridgeshire , UK
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Budohoski KP, Tajsic T, Bal J, Levrini V, Ling Cao JJ, Guilfoyle MR, Couldwell WT, Helmy AE, Kirollos RW, Kirkpatrick PJ, Trivedi RA. Results of Surgical Treatment of Aneurysmal Subarachnoid Hemorrhage in a Single Institution Over 12 Years. World Neurosurg 2023; 180:e341-e349. [PMID: 37769843 DOI: 10.1016/j.wneu.2023.09.070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 09/18/2023] [Indexed: 10/03/2023]
Abstract
OBJECTIVE For patients with aneurysmal subarachnoid hemorrhage (aSAH) in whom endovascular treatment is not the optimal treatment strategy, microsurgical clipping remains a viable option. We examined changes in morbidity and outcome over time in patients treated surgically and in relation to surgeon volume and experience. METHODS All patients who underwent microsurgery for aSAH from 2007 to 2019 at our institution were included. We compared technical complication rates and surgical outcomes between experienced (≥50 independent cases) and inexperienced (<50 independent cases) surgeons and between high-volume (≥20 cases/year) and low-volume (<20 cases/year) surgeons. RESULTS Most of the 1,003 aneurysms (970 patients, median age 56 years) were in the middle cerebral (41.4%), anterior communicating (27.6%), and posterior communicating (17.5%) arteries; 46.5% were <7 mm. The technical complication rate was 7%, resulting in postoperative infarct in 4.9% of patients. Nineteen patients (2%) died within 30 days of admission. There were no significant changes in rates of technical complication, postoperative infarct, or mortality over the study period. There were no differences in postoperative infarction and technical complication rates between experienced and inexperienced surgeons (P = 0.28 and P = 0.05, respectively), but there were differences when comparing high-volume and low-volume surgeons (P = 0.03 and P < 0.001, respectively). The independent predictors of postoperative infarctions were aneurysm size (P = 0.001), intraoperative large-vessel injury (P < 0.001), and low surgeon volume (P = 0.03). CONCLUSIONS We present real-world data on surgical morbidity and outcomes after aSAH. We demonstrated a relationship between surgeon volume and outcome for surgical treatment of aSAH, which supports the benefit of subspecialization in cerebrovascular surgery.
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Affiliation(s)
- Karol P Budohoski
- Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City, Utah, USA; Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK.
| | - Tamara Tajsic
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK
| | - Jarnail Bal
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK
| | - Virginia Levrini
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK; Department of Neurosurgery, Amsterdam University Medical Center, Amsterdam, The Netherlands
| | - Jenny Jia Ling Cao
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK
| | - Mathew R Guilfoyle
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK
| | - William T Couldwell
- Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City, Utah, USA
| | - Adel E Helmy
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK
| | - Ramez W Kirollos
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK; Department of Neurosurgery, National Neuroscience Institute, Singapore, Singapore
| | - Peter J Kirkpatrick
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK
| | - Rikin A Trivedi
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrookes Hospital, Cambridge, UK
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Davies B, Mowforth OD, Yordanov S, Alvarez-Berdugo D, Bond S, Nodale M, Kareclas P, Whitehead L, Bishop J, Chandran S, Lamb S, Bacon M, Papadopoulos MC, Starkey M, Sadler I, Smith L, Kalsi-Ryan S, Carpenter A, Trivedi RA, Wilby M, Choi D, Wilkinson IB, Fehlings MG, Hutchinson PJ, Kotter MRN. Targeting patient recovery priorities in degenerative cervical myelopathy: design and rationale for the RECEDE-Myelopathy trial-study protocol. BMJ Open 2023; 13:e061294. [PMID: 36882259 PMCID: PMC10008337 DOI: 10.1136/bmjopen-2022-061294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
Abstract
INTRODUCTION Degenerative cervical myelopathy (DCM) is a common and disabling condition of symptomatic cervical spinal cord compression secondary to degenerative changes in spinal structures leading to a mechanical stress injury of the spinal cord. RECEDE-Myelopathy aims to test the disease-modulating activity of the phosphodiesterase 3/phosphodiesterase 4 inhibitor Ibudilast as an adjuvant to surgical decompression in DCM. METHODS AND ANALYSIS RECEDE-Myelopathy is a multicentre, double-blind, randomised, placebo-controlled trial. Participants will be randomised to receive either 60-100 mg Ibudilast or placebo starting within 10 weeks prior to surgery and continuing for 24 weeks after surgery for a maximum of 34 weeks. Adults with DCM, who have a modified Japanese Orthopaedic Association (mJOA) score 8-14 inclusive and are scheduled for their first decompressive surgery are eligible for inclusion. The coprimary endpoints are pain measured on a visual analogue scale and physical function measured by the mJOA score at 6 months after surgery. Clinical assessments will be undertaken preoperatively, postoperatively and 3, 6 and 12 months after surgery. We hypothesise that adjuvant therapy with Ibudilast leads to a meaningful and additional improvement in either pain or function, as compared with standard routine care. STUDY DESIGN Clinical trial protocol V.2.2 October 2020. ETHICS AND DISSEMINATION Ethical approval has been obtained from HRA-Wales.The results will be presented at an international and national scientific conferences and in a peer-reviewed journals. TRIAL REGISTRATION NUMBER ISRCTN Number: ISRCTN16682024.
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Affiliation(s)
- Benjamin Davies
- Department of Neurosurgery, Cambridge University, Cambridge, UK
| | | | - Stefan Yordanov
- Department of Neurosurgery, Cambridge University, Cambridge, UK
| | | | - Simon Bond
- Cambridge Clinical Trials Unit, Cambridge University Hospital, Cambridge, UK
| | - Marianna Nodale
- Cambridge Clinical Trials Unit, Cambridge University Hospital, Cambridge, UK
| | - Paula Kareclas
- Cambridge Clinical Trials Unit, Cambridge University Hospital, Cambridge, UK
| | - Lynne Whitehead
- Pharmacy Department, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Jon Bishop
- Medical Statistician, NIHR Surgical Reconstruction and Microbiology Research Centre, Birmingham, UK
| | - Siddharthan Chandran
- Edinburgh Medical School & Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
| | - Sarah Lamb
- Institute of Health Research, University of Exeter, Exeter, UK
| | - Mark Bacon
- International Spinal Research Trust, London, UK
| | | | | | | | | | | | - Adrian Carpenter
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Rikin A Trivedi
- Department of Neurosurgery, Cambridge University, Cambridge, UK
| | - Martin Wilby
- Department of Neurosurgery, The Walton Centre NHS Foundation Trust, Liverpool, UK
| | - David Choi
- Department of Neurosurgery, National Hospital for Neurology and Neurosurgery, London, UK
| | - Ian B Wilkinson
- Cambridge Clinical Trials Unit, Cambridge University Hospital, Cambridge, UK
| | - Michael G Fehlings
- Department of Surgery, Toronto Western Hospital and University of Toronto, Toronto, Ontario, Canada
| | | | - Mark R N Kotter
- Department of Neurosurgery, Cambridge University, Cambridge, UK
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5
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Tsyben A, Guilfoyle MR, Laing RJC, Timofeev I, Anwar F, Trivedi RA, Kirollos RW, Turner C, Allanson J, Mee H, Outtrim JG, Menon DK, Hutchinson PJA, Helmy A. Comparison of health-related quality of life in patients with traumatic brain injury, subarachnoid haemorrhage and cervical spine disease. Br J Neurosurg 2022:1-7. [PMID: 36495241 DOI: 10.1080/02688697.2022.2152777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 11/23/2022] [Indexed: 12/14/2022]
Abstract
PURPOSE The degree of disability that is acceptable to patients following traumatic brain injury (TBI) continues to be debated. While the dichotomization of outcome on the Glasgow Outcome Score (GOSE) into 'favourable' and 'unfavourable' continues to guide clinical decisions, this may not reflect an individual's subjective experience. The aim of this study is to assess how patients' self-reported quality of life (QoL) relates to objective outcome assessments and how it compares to other debilitating neurosurgical pathologies, including subarachnoid haemorrhage (SAH) and cervical myelopathy. METHOD A retrospective analysis of over 1300 patients seen in Addenbrooke's Hospital, Cambridge, UK with TBI, SAH and patients pre- and post- cervical surgery was performed. QoL was assessed using the SF-36 questionnaire. Kruskal-Wallis test was used to analyse the difference in SF-36 domain scores between the four unpaired patient groups. To determine how the point of dichotomization of GOSE into 'favourable' and 'unfavourable' outcome affected QOL, SF-36 scores were compared between GOSE and mRS. RESULTS There was a statistically significant difference in the median Physical Component Score (PCS) and Mental Component Score (MCS) of SF-36 between the three neurosurgical pathologies. Patients with TBI and SAH scored higher on most SF-36 domains when compared with cervical myelopathy patients in the severe category. While patients with Upper Severe Disability on GOSE showed significantly higher PC and MC scores compared to GOSE 3, there was a significant degree of variability in individual responses across the groups. CONCLUSION A significant number of patients following TBI and SAH have better self-reported QOL than cervical spine patients and patients' subjective perception and expectations following injury do not always correspond to objective disability. These results can guide discussion of treatment and outcomes with patients and families.
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Affiliation(s)
- Anastasia Tsyben
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Mathew R Guilfoyle
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Rodney J C Laing
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Ivan Timofeev
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Fahim Anwar
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Rikin A Trivedi
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | | | - Carole Turner
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Judith Allanson
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Harry Mee
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Joanne G Outtrim
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - David K Menon
- Neurocritical Care Unit & University Department of Anaesthesia, Addenbrooke's Hospital & University of Cambridge, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Peter J A Hutchinson
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Adel Helmy
- Department of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom of Great Britain and Northern Ireland
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Budohoski KP, Barone DG, Kirollos RW, Santarius T, Trivedi RA. Far Lateral Approaches: Far Lateral Approach With Minimal Condylectomy for C2 Schwannoma: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2022; 22:e49. [DOI: 10.1227/ons.0000000000000032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 08/16/2021] [Indexed: 11/19/2022] Open
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7
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Budohoski KP, Barone DG, Mediratta S, Ross MI, Kirollos RW, Santarius T, Trivedi RA. Far Lateral Approaches: C1 Meningioma With Vertebral Artery Involvement: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2022; 22:e48. [DOI: 10.1227/ons.0000000000000031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 08/13/2021] [Indexed: 11/18/2022] Open
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8
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Budohoski KP, Barone DG, Mediratta S, Ross M, Kirollos RW, Santarius T, Trivedi RA. Far Lateral Approaches: Dural Arteriovenous Fistulae at the Hypoglossal Canal: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2022; 22:e50. [DOI: 10.1227/ons.0000000000000033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 08/16/2021] [Indexed: 11/19/2022] Open
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9
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Budohoski KP, Tajsic T, Barone DG, Guilfoyle M, Santarius T, Kirollos RW, Trivedi RA. Surgical Resection of an Arteriovenous Malformation of the Orbital Surface of the Frontal Lobe with Olfactory Tract Preservation: 2-Dimensional Operative Video. World Neurosurg 2021; 158:156-157. [PMID: 34798340 DOI: 10.1016/j.wneu.2021.11.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 11/05/2021] [Accepted: 11/06/2021] [Indexed: 11/27/2022]
Abstract
Medial orbitofrontal area arteriovenous malformations (AVMs) are located in the noneloquent cortex and typically drain superficially into Sylvian veins or the superior sagittal sinus, making them favorable for surgical treatment. However, while typically supplied by pial/cortical branches of the anterior cerebral artery (ACA), they can incorporate the recurrent artery of Heubner and other ACA perforators on their way to the anterior perforated substance located just posterior. We present a case of a 30-year-old female admitted with sudden collapse and intraventricular hemorrhage from a ruptured medial orbitofrontal area AVM. She was admitted to the intensive care unit and an external ventricular drain was placed to treat acute hydrocephalus. Catheter angiography demonstrated an AVM located just anteromedial to the termination of the internal carotid artery with a compact nidus and an associated intranidal flow aneurysm. Arterial supply originated from the orbitofrontal artery off the ACA, with medial lenticulostriates seen coursing past the nidus. Additional supply from the recurrent artery of Heubner could not be excluded. However, a hypodensity in the inferior frontal lobe seen on the presentation computed tomography scan was suggestive of a prior orbitofrontal infarct and thus cortical, rather than perforator, supply. In our practice, treatment of ruptured AVMs is dictated by the patients' clinical recovery and associated high-risk features (e.g., flow aneurysms). In this case, despite the presence of a flow aneurysm, treatment was delayed 18 days due to slow neurologic recovery and family preference. The patient remained in the intensive care unit under close neurologic observation. She was extubated on day 10, and the external ventricular drain was removed on day 12 after confirming resolution of intraventricular hemorrhage. Preoperatively the patient recovered to a Glasgow Coma Scale score of 15. Risks of treatment were discussed, and informed consent was obtained. The patient was treated using a standard pterional craniotomy. We describe the anatomic location of the lesion in the medial orbitofrontal area, the relationship to the olfactory tract and olfactory stria. We demonstrate olfactory tract dissection from its arachnoid cistern between the orbitofrontal lobe and gyrus rectus in order to access the lesion. Indocyanine green angiography is used to help surgical dissection and for quality control at the end of the procedure. We do not perform intraoperative angiography routinely; however, it can be a useful adjunct in deep and/or eloquent locations, which are difficult to image using videoangiography. Nevertheless, in the absence of intraoperative angiography close dissection directly over the nidus on the eloquent side ensures preservation of functional brain. We describe the microsurgical techniques of surgical treatment of AVMs, in particular the "cone" dissection technique of the AVM in order to allow identification of all feeding vessels and tracing "en passant" vessels from proximal to distal, as well as the use of intraoperative videoangiography to elucidate the nidus morphology and immediate postoperative quality control (Video 1, available at https://drive.google.com/file/d/1IXuLg84MwyMek1_Z1f1n7qssLThimvdx/view?usp=sharing).
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Affiliation(s)
- Karol P Budohoski
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrooke's Hospital, Cambridge, United Kingdom.
| | - Tamara Tajsic
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Damiano G Barone
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Mathew Guilfoyle
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Thomas Santarius
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrooke's Hospital, Cambridge, United Kingdom
| | - Ramez W Kirollos
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrooke's Hospital, Cambridge, United Kingdom; Department of Neurosurgery, National Neuroscience Institute, Singapore
| | - Rikin A Trivedi
- Department of Neurosurgery, Cambridge University Hospitals, Addenbrooke's Hospital, Cambridge, United Kingdom
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Budohoski KP, Mohan M, Millar Z, Tajsic T, Barone DG, Cao JJL, Mediratta S, Phelps E, Sukthankar T, Kirollos RW, Helmy AE, Guilfoyle MR, Trivedi RA. Longitudinal Changes in Size of Conservatively Managed Flow-Related Aneurysms Associated with Brain Arteriovenous Malformations. World Neurosurg 2021; 154:e754-e761. [PMID: 34358686 DOI: 10.1016/j.wneu.2021.07.125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 07/26/2021] [Accepted: 07/27/2021] [Indexed: 11/18/2022]
Abstract
BACKGROUND Flow aneurysms (FAs) associated with brain arteriovenous malformations (AVMs) are thought to arise from increased hemodynamic stress due to high-flow shunting. This study aims to describe the changes in conservatively managed FAs after successful AVM treatment. METHODS Patients with symptomatic AVMs and associated FAs who underwent successful treatment of the AVM between 2008 and 2017 were included. FA dimensions were measured on surveillance angiography to assess longitudinal changes. RESULTS Thirty-two patients were identified with 48 FAs. Sixteen (33%) FAs were treated endovascularly; 18 (38%) FAs were treated surgically; and 14 (29%) FAs (11 patients) were monitored. FAs demonstrated a decrease in size from 5.0 mm to 3.8 mm (24%; P = 0.016) and 4.9 mm to 3.6 mm (27%; P = 0.013) in height and width, respectively, over a median 35 months. However, on subgroup analysis, only class IIb aneurysms demonstrated a significant decrease in size (51% reduction in largest diameter, P = 0.046) and only 3 FAs (21%) resolved. There were no hemorrhages observed during follow-up. CONCLUSIONS While conservatively managed FAs demonstrated a reduction in size after the culprit AVM was treated, this was only significant in FAs located close to an AVM nidus (class IIb). There were no hemorrhages during the median 35 months' follow-up; however, long-term data are lacking. Our data support close observation of all conservatively managed aneurysms and a tailored approach based on the proximity to the nidus and observed changes in size.
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Affiliation(s)
- Karol P Budohoski
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom.
| | - Midhun Mohan
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Zack Millar
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Tamara Tajsic
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Damiano G Barone
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Jennifer J L Cao
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Saniya Mediratta
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Ellie Phelps
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Tanmay Sukthankar
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Ramez W Kirollos
- Department of Neurosurgery, National Neurosciences Institute, Singapore, Singapore
| | - Adel E Helmy
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom; Division of Neurosurgery, Department of Clinical Neurosciences, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Mathew R Guilfoyle
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
| | - Rikin A Trivedi
- Department of Neurosurgery, Cambridge University Hospitals, University of Cambridge, Cambridge, United Kingdom
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11
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Griswold DP, Khan AA, Chao TE, Clark DJ, Budohoski K, Devi BI, Azad TD, Grant GA, Trivedi RA, Rubiano AM, Johnson WD, Park KB, Broekman M, Servadei F, Hutchinson PJ, Kolias AG. Neurosurgical Randomized Trials in Low- and Middle-Income Countries. Neurosurgery 2021; 87:476-483. [PMID: 32171011 PMCID: PMC7426187 DOI: 10.1093/neuros/nyaa049] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Accepted: 12/28/2019] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND The setting of a randomized trial can determine whether its findings are generalizable and can therefore apply to different settings. The contribution of low- and middle-income countries (LMICs) to neurosurgical randomized trials has not been systematically described before. OBJECTIVE To perform a systematic analysis of design characteristics and methodology, funding source, and interventions studied between trials led by and/or conducted in high-income countries (HICs) vs LMICs. METHODS From January 2003 to July 2016, English-language trials with >5 patients assessing any one neurosurgical procedure against another procedure, nonsurgical treatment, or no treatment were retrieved from MEDLINE, Scopus, and Cochrane Library. Income classification for each country was assessed using the World Bank Atlas method. RESULTS A total of 73.3% of the 397 studies that met inclusion criteria were led by HICs, whereas 26.7% were led by LMICs. Of the 106 LMIC-led studies, 71 were led by China. If China is excluded, only 8.8% were led by LMICs. HIC-led trials enrolled a median of 92 patients vs a median of 65 patients in LMIC-led trials. HIC-led trials enrolled from 7.6 sites vs 1.8 sites in LMIC-led studies. Over half of LMIC-led trials were institutionally funded (54.7%). The majority of both HIC- and LMIC-led trials evaluated spinal neurosurgery, 68% and 71.7%, respectively. CONCLUSION We have established that there is a substantial disparity between HICs and LMICs in the number of published neurosurgical trials. A concerted effort to invest in research capacity building in LMICs is an essential step towards ensuring context- and resource-specific high-quality evidence is generated.
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Affiliation(s)
- Dylan P Griswold
- Stanford University School of Medicine, Stanford, California.,Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Ahsan A Khan
- NIHR Global Health Research Group on Neurotrauma, University of Cambridge, Cambridge, United Kingdom.,Neuroscience Institute, INUB-MEDITECH Research Group, El Bosque University, Bogotá, Colombia
| | - Tiffany E Chao
- Stanford University School of Medicine, Stanford, California.,Department of Surgery, Santa Clara Valley Medical Center, San Jose, California
| | - David J Clark
- NIHR Global Health Research Group on Neurotrauma, University of Cambridge, Cambridge, United Kingdom.,Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Karol Budohoski
- NIHR Global Health Research Group on Neurotrauma, University of Cambridge, Cambridge, United Kingdom.,Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - B Indira Devi
- NIHR Global Health Research Group on Neurotrauma, University of Cambridge, Cambridge, United Kingdom.,Department of Neurosurgery, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India
| | - Tej D Azad
- Stanford University School of Medicine, Stanford, California.,Department of Neurosurgery, Johns Hopkins University, Baltimore, Maryland
| | - Gerald A Grant
- Stanford University School of Medicine, Stanford, California
| | - Rikin A Trivedi
- NIHR Global Health Research Group on Neurotrauma, University of Cambridge, Cambridge, United Kingdom.,Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Andres M Rubiano
- NIHR Global Health Research Group on Neurotrauma, University of Cambridge, Cambridge, United Kingdom.,Neuroscience Institute, INUB-MEDITECH Research Group, El Bosque University, Bogotá, Colombia
| | - Walter D Johnson
- Emergency and Essential Surgical Care Programme, World Health Organization, Geneva, Switzerland
| | - Kee B Park
- Global Neurosurgery Initiative, Program in Global Surgery and Social Change, Department of Global Health and Social Medicine, Harvard Medical School, Boston, Massachusetts
| | - Marike Broekman
- Department of Neurosurgery, Leiden University Medical Center, Leiden and Haaglanden Medical Center, the Hague, the Netherlands
| | - Franco Servadei
- Department of Neurosurgery, Humanitas Research Hospital, Humanitas University, Milan, Italy
| | - Peter J Hutchinson
- NIHR Global Health Research Group on Neurotrauma, University of Cambridge, Cambridge, United Kingdom.,Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Angelos G Kolias
- NIHR Global Health Research Group on Neurotrauma, University of Cambridge, Cambridge, United Kingdom.,Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
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12
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Patel K, Budohoski KP, Olijnyk LD, Bulstrode H, Santarius T, Kirollos RW, Trivedi RA. Infratentorial Supracerebellar Approach for Resection of Midbrain Cavernous Malformation: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2020; 18:E44. [PMID: 31162594 DOI: 10.1093/ons/opz114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Accepted: 01/21/2019] [Indexed: 11/12/2022] Open
Abstract
Cavernous malformations (cavernomas) of the brain stem with recurrent hemorrhage may be amenable to microsurgical resection if they are present close to the surface. The risks of surgery need to be balanced with the natural history of the lesion and the accumulation of neurological deficits and risk to life with multiple hemorrhages. In this 3D operative video, we illustrate the technique for the resection of a dorsally located midbrain cavernous malformation. Informed consent was obtained for this procedure. The cavernoma is accessed with the use of a supracerebellar infratentorial approach. The infratentorial craniotomy and coagulation of the superior vermian veins is shown. A description is provided of the use of hemosiderin staining and the intercollicular relative "safe zone"1 as landmarks for the neurotomy. The technique of cavernoma dissection from the surrounding gliotic plane is shown and described. In this case, the patient required prolonged rehabilitation but fully recovered without residual deficit 1 yr following surgery.
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Affiliation(s)
- Krunal Patel
- Division of Neurosurgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | - Karol P Budohoski
- Division of Neurosurgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | | | - Harry Bulstrode
- Division of Neurosurgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | - Thomas Santarius
- Division of Neurosurgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | - Ramez W Kirollos
- Division of Neurosurgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
| | - Rikin A Trivedi
- Division of Neurosurgery, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom
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13
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Kindl RP, Patel K, Trivedi RA. Supraclavicular Brachial Plexus Approach for Excision of C8 Nerve Root Schwannoma: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2019; 16:634-635. [DOI: 10.1093/ons/opy209] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 07/11/2018] [Indexed: 11/13/2022] Open
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14
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Patel K, Budohoski KP, Kenyon ORP, Barone DG, Santarius T, Kirollos RW, Mannion RJ, Trivedi RA. Anterolateral Approach for Central Thoracic Disc Prolapse—Surgical Strategies Used to Tackle Differing Operative Findings: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2019; 16:E5-E6. [DOI: 10.1093/ons/opy063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Accepted: 03/11/2018] [Indexed: 11/12/2022] Open
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15
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Patel K, Olijnyk LD, Budohoski KP, Santarius T, Kirollos RW, Trivedi RA. Awake Craniotomy for Resection of Left Temporal Cavernoma: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2018; 17:E102. [DOI: 10.1093/ons/opy381] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 12/06/2018] [Indexed: 11/13/2022] Open
Abstract
Abstract
Cavernomas presenting with seizures refractory to medical treatment may require surgical excision for seizure control. If superficial, they can be surgically accessible but can pose additional risks when located in or near eloquent cortex. In this 3D operative video we illustrate the technique for the resection of a left temporal cavernoma located near eloquent cortex for speech with awake surgery and cortical mapping to avoid a speech deficit postoperatively.
Informed consent was obtained for this procedure. Navigation is used to localize the cavernoma following which a large craniotomy is performed exposing the temporal lobe, frontal lobe, and sylvian vein. Bipolar stimulation is used to localize speech with the patient awake until speech arrest occurs. The cavernoma is situated immediately inferior to the sulcus over which speech arrest occurs. The sulcus immediately above the cavernoma is opened and adjacent arteries are carefully preserved. The glial plane around the cavernoma is used to dissect the cavernoma from the surrounding cortex. Care is taken to remove the haemosiderin as this can act as a precipitant for ongoing seizures.
In this case the patient had no neurological deficits following surgery and was seizure free.
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Affiliation(s)
- Krunal Patel
- Division of Neurosurgery, Cambridge University Hospital's NHS Foundation Trust, Cambridge, United Kingdom
| | | | - Karol P Budohoski
- Division of Neurosurgery, Cambridge University Hospital's NHS Foundation Trust, Cambridge, United Kingdom
| | - Thomas Santarius
- Division of Neurosurgery, Cambridge University Hospital's NHS Foundation Trust, Cambridge, United Kingdom
| | - Ramez W Kirollos
- Division of Neurosurgery, Cambridge University Hospital's NHS Foundation Trust, Cambridge, United Kingdom
| | - Rikin A Trivedi
- Division of Neurosurgery, Cambridge University Hospital's NHS Foundation Trust, Cambridge, United Kingdom
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16
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Patel K, McMillen J, Kirollos RW, Budohoski KP, Santarius T, Trivedi RA. Type I Spinal Dural Fistula Treated Using a Minimally Invasive Approach With a 20-mm Nonexpandable Tubular Retractor: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2018. [DOI: 10.1093/ons/opy032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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17
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Budohoski KP, Guilfoyle MR, Barone DG, Kirollos RW, Trivedi RA, Santarius T. Radical, Staged Approach to Extensive Posterior Fossa Pediatric Ependymoma: 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2018; 14:705. [DOI: 10.1093/ons/opx206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Budohoski KP, Ngerageza JG, Austard B, Fuller A, Galler R, Haglund M, Lett R, Lieberman IH, Mangat HS, March K, Olouch-Olunya D, Piquer J, Qureshi M, Santos MM, Schöller K, Shabani HK, Trivedi RA, Young P, Zubkov MR, Härtl R, Stieg PE. Neurosurgery in East Africa: Innovations. World Neurosurg 2018; 113:436-452. [PMID: 29702967 DOI: 10.1016/j.wneu.2018.01.085] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In the last 10 years, considerable work has been done to promote and improve neurosurgical care in East Africa with the development of national training programs, expansion of hospitals and creation of new institutions, and the foundation of epidemiologic and cost-effectiveness research. Many of the results have been accomplished through collaboration with partners from abroad. This article is the third in a series of articles that seek to provide readers with an understanding of the development of neurosurgery in East Africa (Foundations), the challenges that arise in providing neurosurgical care in developing countries (Challenges), and an overview of traditional and novel approaches to overcoming these challenges to improve healthcare in the region (Innovations). In this article, we describe the ongoing programs active in East Africa and their current priorities, and we outline lessons learned and what is required to create self-sustained neurosurgical service.
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Affiliation(s)
- Karol P Budohoski
- Department of Neurosurgery, Addenbrooke's Hospital, University of Cambridge, United Kingdom
| | - Japhet G Ngerageza
- Department of Neurosurgery, Muhimbili Orthopedic-Neurosurgical Institute, Dar es Salaam, Tanzania
| | - Benedict Austard
- Department of Neurosurgery, Muhimbili Orthopedic-Neurosurgical Institute, Dar es Salaam, Tanzania
| | - Anthony Fuller
- Duke Global Neurosurgery and Neuroscience, Duke University, Durham, North Carolina, USA
| | - Robert Galler
- Department of Neurosurgery, Stony Brook Neuroscience Institute, New York, New York, USA
| | - Michael Haglund
- Duke Global Neurosurgery and Neuroscience, Duke University, Durham, North Carolina, USA
| | - Ronald Lett
- Department of Surgery, University of British Columbia, Vancouver, Canada
| | | | - Halinder S Mangat
- Division of Stroke and Critical Care, Department of Neurology, Weill Cornell Medicine, New York Presbyterian Hospital, New York, New York, USA
| | - Karen March
- University of Washington School of Nursing, Seattle, Washington, USA
| | - David Olouch-Olunya
- Department of Neurosurgery, Kenyatta Hospital, University of Nairobi, Nairobi, Kenya
| | - José Piquer
- Neurosurgical Unit, Hospital Universitario de la Ribera, Valencia, Spain
| | - Mahmood Qureshi
- Department of Neurosurgery, Aga Khan University Hospital, Nairobi, Kenya
| | - Maria M Santos
- Global Health, Weill Cornell Medicine, New York, New York, USA
| | - Karsten Schöller
- Department of Neurosurgery, Justus-Liebig-Universität Gießen, Gießen, Germany
| | - Hamisi K Shabani
- Department of Neurosurgery, Muhimbili Orthopedic-Neurosurgical Institute, Dar es Salaam, Tanzania
| | - Rikin A Trivedi
- Department of Neurosurgery, Addenbrooke's Hospital, University of Cambridge, United Kingdom
| | - Paul Young
- Department of Neurosurgery, University of St. Louis, St. Louis, Missouri, USA
| | - Micaella R Zubkov
- Weill Cornell Brain and Spine Center, Department of Neurological Surgery, Weill-Cornell Medicine, New York-Presbyterian Hospital, New York, New York, USA
| | - Roger Härtl
- Weill Cornell Brain and Spine Center, Department of Neurological Surgery, Weill-Cornell Medicine, New York-Presbyterian Hospital, New York, New York, USA.
| | - Philip E Stieg
- Weill Cornell Brain and Spine Center, Department of Neurological Surgery, Weill-Cornell Medicine, New York-Presbyterian Hospital, New York, New York, USA
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Budohoski KP, Patel K, Guilfoyle MR, Barone DG, Sethi M, Kirollos RW, Higgins NJ, Santarius T, Trivedi RA. Intradural Spinal Arteriovenous Malformation of the Conus Medullaris—Management Strategies and Surgical Nuances: 3-Dimensional Video. Oper Neurosurg (Hagerstown) 2018; 14:592. [DOI: 10.1093/ons/opx198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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20
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Budohoski KP, Guilfoyle MR, Kenyon O, Barone DG, Santarius T, Trivedi RA. Microsurgical Resection of a Common Peroneal Nerve Schwannoma: A 3-Dimensional Operative Video. Oper Neurosurg (Hagerstown) 2018; 14:83. [PMID: 28521057 DOI: 10.1093/ons/opx066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Peripheral nerve sheath tumors are benign entities that manifest with pain or neurological deficits from mass effect. Treatment is mostly surgical, however, the aggressiveness of treatment needs to be carefully considered with respect to preserving function. We present a case of a 62-year-old male with a 2-year history of left lower extremity pain radiating toward the dorsolateral foot. There was a tender and palpable mass in the lateral popliteal fossa with imaging consistent with Schwannoma of the common peroneal nerve. The patient was counseled for surgery and informed consent was obtained. Microsurgical resection was undertaken and gross total resection was achieved without compromise of function. We demonstrate the placement of neurophysiological monitoring electrodes in all 3 compartment of the calf as well as the use of stimulation to identify a nonfunctioning area for entering the nerve sheath. Anatomy of the popliteal fossa and microsurgical technique for resection of nerve sheath tumors are discussed. When dealing with these pathologies, it is important to use intraoperative neurophysiology as well as careful technique in order to achieve maximal resection without compromising neurological function.
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Affiliation(s)
- Karol P Budohoski
- Department of Neurosurgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Mathew R Guilfoyle
- Department of Neurosurgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | | | - Damiano G Barone
- Department of Neurosurgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK.,Department of Neurosurgery, The Walton Centre, Liverpool, UK.,Brain Repair Centre, University of Cambridge, Cambridge, UK
| | - Thomas Santarius
- Department of Neurosurgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Rikin A Trivedi
- Department of Neurosurgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
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21
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Clark AD, Guilfoyle MR, Candy NG, Budohoski KP, Hofmann R, Barone DG, Santarius T, Kirollos RW, Trivedi RA. Stereoscopic Three-Dimensional Neuroanatomy Lectures Enhance Neurosurgical Training: Prospective Comparison with Traditional Teaching. World Neurosurg 2017; 108:917-923.e5. [PMID: 28919228 DOI: 10.1016/j.wneu.2017.09.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2017] [Revised: 09/02/2017] [Accepted: 09/04/2017] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Stereoscopic three-dimensional (3D) imaging is increasingly used in the teaching of neuroanatomy and although this is mainly aimed at undergraduate medical students, it has enormous potential for enhancing the training of neurosurgeons. This study aims to assess whether 3D lecturing is an effective method of enhancing the knowledge and confidence of neurosurgeons and how it compares with traditional two-dimensional (2D) lecturing and cadaveric training. METHODS Three separate teaching sessions for neurosurgical trainees were organized: 1) 2D course (2D lecture + cadaveric session), 2) 3D lecture alone, and 3) 3D course (3D lecture + cadaveric session). Before and after each session, delegates were asked to complete questionnaires containing questions relating to surgical experience, anatomic knowledge, confidence in performing procedures, and perceived value of 3D, 2D, and cadaveric teaching. RESULTS Although both 2D and 3D lectures and courses were similarly effective at improving self-rated knowledge and understanding, the 3D lecture and course were associated with significantly greater gains in confidence reported by the delegates for performing a subfrontal approach and sylvian fissure dissection. CONCLUSIONS Stereoscopic 3D lectures provide neurosurgical trainees with greater confidence for performing standard operative approaches and enhances the benefit of subsequent practical experience in developing technical skills in cadaveric dissection.
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Affiliation(s)
- Anna D Clark
- University of Cambridge School of Clinical Medicine, Cambridge, UK
| | - Mathew R Guilfoyle
- Cambridge University Hospitals Foundation Trust, Cambridge, UK; Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Nicholas G Candy
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Karol P Budohoski
- Cambridge University Hospitals Foundation Trust, Cambridge, UK; Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Riikka Hofmann
- Department of Education, University of Cambridge, Cambridge, UK
| | - Damiano G Barone
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - Thomas Santarius
- University of Cambridge School of Clinical Medicine, Cambridge, UK; Cambridge University Hospitals Foundation Trust, Cambridge, UK
| | | | - Rikin A Trivedi
- Cambridge University Hospitals Foundation Trust, Cambridge, UK.
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22
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Clark AD, Barone DG, Candy N, Guilfoyle M, Budohoski K, Hofmann R, Santarius T, Kirollos R, Trivedi RA. The Effect of 3-Dimensional Simulation on Neurosurgical Skill Acquisition and Surgical Performance: A Review of the Literature. J Surg Educ 2017; 74:828-836. [PMID: 28341408 DOI: 10.1016/j.jsurg.2017.02.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 01/21/2017] [Accepted: 02/05/2017] [Indexed: 06/06/2023]
Abstract
OBJECTIVE In recent years, 3-dimensional (3D) simulation of neurosurgical procedures has become increasingly popular as an addition to training programmes. However, there remains little objective evidence of its effectiveness in improving live surgical skill. This review analysed the current literature in 3D neurosurgical simulation, highlighting remaining gaps in the evidence base for improvement in surgical performance and suggests useful future research directions. DESIGN An electronic search of the databases was conducted to identify studies investigating 3D virtual reality (VR) simulation for various types of neurosurgery. Eligible studies were those that used a combination of metrics to measure neurosurgical skill acquisition on a simulation trainer. Studies were excluded if they did not measure skill acquisition against a set of metrics or if they assessed skills that were not used in neurosurgical practice. This was not a systematic review however, the data extracted was tabulated to allow comparison between studies RESULTS: This study revealed that the average overall quality of the included studies was moderate. Only one study assessed outcomes in live surgery, while most other studies assessed outcomes on a simulator using a variety of metrics. CONCLUSIONS It is concluded that in its current state, the evidence for 3D simulation suggests it as a useful supplement to training programmes but more evidence is needed of improvement in surgical performance to warrant large-scale investment in this technology.
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Affiliation(s)
- Anna D Clark
- School of Clinical Medicine, University of Cambridge, Hills Road, Cambridge CB2 0SP, United Kingdom
| | - Damiano G Barone
- Department of Clinical Neurosciences, University of Cambridge, Hills Road, Cambridge, CB2 0QQ, United Kingdom; Division of Neurosurgery, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0QQ, United Kingdom
| | - Nicholas Candy
- Department of Clinical Neurosciences, University of Cambridge, Hills Road, Cambridge, CB2 0QQ, United Kingdom; Division of Neurosurgery, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0QQ, United Kingdom
| | - Mathew Guilfoyle
- Department of Clinical Neurosciences, University of Cambridge, Hills Road, Cambridge, CB2 0QQ, United Kingdom; Division of Neurosurgery, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0QQ, United Kingdom
| | - Karol Budohoski
- Division of Neurosurgery, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0QQ, United Kingdom
| | - Riikka Hofmann
- Faculty of Education, University of Cambridge, Hills Road, Cambridge, CB2 8PQ, United Kingdom
| | - Thomas Santarius
- School of Clinical Medicine, University of Cambridge, Hills Road, Cambridge CB2 0SP, United Kingdom; Division of Neurosurgery, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0QQ, United Kingdom
| | - Ramez Kirollos
- Division of Neurosurgery, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0QQ, United Kingdom
| | - Rikin A Trivedi
- Division of Neurosurgery, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 0QQ, United Kingdom.
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Patel K, Tajsic T, Budohoski KP, Guilfoyle MR, Trivedi RA. Simultaneous navigated cervico-thoracic and thoraco-lumbar fixation. Eur Spine J 2017; 27:318-322. [DOI: 10.1007/s00586-017-5233-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Revised: 01/19/2017] [Accepted: 07/19/2017] [Indexed: 11/28/2022]
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Hart MG, Housden CR, Suckling J, Tait R, Young A, Müller U, Newcombe VFJ, Jalloh I, Pearson B, Cross J, Trivedi RA, Pickard JD, Sahakian BJ, Hutchinson PJ. Advanced magnetic resonance imaging and neuropsychological assessment for detecting brain injury in a prospective cohort of university amateur boxers. Neuroimage Clin 2017; 15:194-199. [PMID: 28529875 PMCID: PMC5429235 DOI: 10.1016/j.nicl.2017.04.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 04/22/2017] [Accepted: 04/25/2017] [Indexed: 10/25/2022]
Abstract
BACKGROUND/AIM The safety of amateur and professional boxing is a contentious issue. We hypothesised that advanced magnetic resonance imaging and neuropsychological testing could provide evidence of acute and early brain injury in amateur boxers. METHODS We recruited 30 participants from a university amateur boxing club in a prospective cohort study. Magnetic resonance imaging (MRI) and neuropsychological testing was performed at three time points: prior to starting training; within 48 h following a first major competition to detect acute brain injury; and one year follow-up. A single MRI acquisition was made from control participants. Imaging analysis included cortical thickness measurements with Advanced Normalization Tools (ANTS) and FreeSurfer, voxel based morphometry (VBM), and Tract Based Spatial Statistics (TBSS). A computerized battery of neuropsychological tests was performed assessing attention, learning, memory and impulsivity. RESULTS During the study period, one boxer developed seizures controlled with medication while another developed a chronic subdural hematoma requiring neurosurgical drainage. A total of 10 boxers contributed data at to the longitudinal assessment protocol. Reasons for withdrawal were: logistics (10), stopping boxing (7), withdrawal of consent (2), and development of a chronic subdural hematoma (1). No significant changes were detected using VBM, TBSS, cortical thickness measured with FreeSurfer or ANTS, either cross-sectionally at baseline, or longitudinally. Neuropsychological assessment of boxers found attention/concentration improved over time while planning and problem solving ability latency decreased after a bout but recovered after one year. CONCLUSION While this neuroimaging and neuropsychological assessment protocol could not detect any evidence of brain injury, one boxer developed seizures and another developed a chronic sub-dural haematoma.
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Affiliation(s)
- M G Hart
- Academic Division of Neurosurgery, Department of Clinical Neurosciences, Department of Neurosurgery, Box 167, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom.
| | - C R Housden
- Department of Psychiatry, University of Cambridge and the MRC/Wellcome Trust Behavioural and Clinical Neuroscience Institute, Cambridge CB2 2QQ, United Kingdom
| | - J Suckling
- Department of Psychiatry, University of Cambridge and the MRC/Wellcome Trust Behavioural and Clinical Neuroscience Institute, Cambridge CB2 2QQ, United Kingdom
| | - R Tait
- Department of Psychiatry, University of Cambridge and the MRC/Wellcome Trust Behavioural and Clinical Neuroscience Institute, Cambridge CB2 2QQ, United Kingdom
| | - A Young
- Academic Division of Neurosurgery, Department of Clinical Neurosciences, Department of Neurosurgery, Box 167, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
| | - U Müller
- Department of Psychiatry, University of Cambridge and the MRC/Wellcome Trust Behavioural and Clinical Neuroscience Institute, Cambridge CB2 2QQ, United Kingdom; Adult ADHD Service, Cambridgeshire and Peterborough NHS Foundation Trust, Cambridge Road, Fulbourn, Cambridge CB21 5HH, United Kingdom
| | - V F J Newcombe
- Wolfson Brain Imaging Centre, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom; University Division of Anaesthesia, University of Cambridge, Cambridge CB2 0QQ, United Kingdom
| | - I Jalloh
- Academic Division of Neurosurgery, Department of Clinical Neurosciences, Department of Neurosurgery, Box 167, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
| | - B Pearson
- Academic Division of Neurosurgery, Department of Clinical Neurosciences, Department of Neurosurgery, Box 167, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
| | - J Cross
- Department of Radiology, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
| | - R A Trivedi
- Academic Division of Neurosurgery, Department of Clinical Neurosciences, Department of Neurosurgery, Box 167, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
| | - J D Pickard
- Academic Division of Neurosurgery, Department of Clinical Neurosciences, Department of Neurosurgery, Box 167, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom; Wolfson Brain Imaging Centre, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
| | - B J Sahakian
- Department of Psychiatry, University of Cambridge and the MRC/Wellcome Trust Behavioural and Clinical Neuroscience Institute, Cambridge CB2 2QQ, United Kingdom
| | - P J Hutchinson
- Academic Division of Neurosurgery, Department of Clinical Neurosciences, Department of Neurosurgery, Box 167, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom; Wolfson Brain Imaging Centre, Addenbrooke's Hospital, Cambridge CB2 0QQ, United Kingdom
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Barone DG, Marcus HJ, Guilfoyle MR, Higgins JNP, Antoun N, Santarius T, Trivedi RA, Kirollos RW. Clinical Experience and Results of Microsurgical Resection of Arterioveonous Malformation in the Presence of Space-Occupying Intracerebral Hematoma. Neurosurgery 2017; 81:75-86. [DOI: 10.1093/neuros/nyx003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 01/14/2017] [Indexed: 11/14/2022] Open
Abstract
Abstract
BACKGROUND: Management of ruptured arteriovenous malformations (AVMs) with a mass-producing intracerebral hematoma (ICH) represents a surgical dilemma.
OBJECTIVE: To evaluate the clinical outcome and obliteration rates of microsurgical resection of AVM when performed concomitantly with evacuation of an associated space-occupying ICH.
METHODS: Data of patients with AVM were collected prospectively. Cases were identified in which an AVM was resected and an associated space-occupying ICH was evacuated at the same time, and divided into “group 1,” in which the surgery was performed acutely within 48 h of presentation (secondary to elevated intracranial pressure); and “group 2,” in which selected patients were operated upon in the presence of a liquefying ICH in the “subacute” stage. Clinical outcomes were assessed using the modified Rankin Scale, with a score of 0 to 2 considered a good outcome. Obliteration rates were assessed using postoperative angiography.
RESULTS: From 2001 to 2015, 131 patients underwent microsurgical resection of an AVM, of which 65 cases were included. In “group 1” (n = 21; Spetzler-Ponce class A = 13, class B = 5, and class C = 3), 11 of 21 (52%) had a good outcome and in 18 of 19 (95%) of those who had a postoperative angiogram the AVMs were completely obliterated. In “group 2” (n = 44; Spetzler-Ponce class A = 33, class B = 9, and class C = 2), 31 of 44 (93%) had a good outcome and 42 of 44 (95%) were obliterated with a single procedure. For supratentorial AVMs, the ICH cavity was utilized to provide an operative trajectory to a deep AVM in 11 cases, and in 26 cases the ICH cavity was deep to the AVM and hence facilitated the deep dissection of the nidus.
CONCLUSION: In selected patients the presence of a liquefying ICH cavity may facilitate the resection of AVMs when performed in the subacute stage resulting in a good neurological outcome and high obliteration rate.
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Affiliation(s)
| | - Hani J. Marcus
- Department of Neurosurgery, Adden-brooke's Hospital, Cambridge, UK
| | | | | | - Nagui Antoun
- Department of Neuroradiology, Adden-brooke's Hospital, Cambridge, UK
| | - Thomas Santarius
- Department of Neurosurgery, Adden-brooke's Hospital, Cambridge, UK
| | - Rikin A. Trivedi
- Department of Neurosurgery, Adden-brooke's Hospital, Cambridge, UK
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Young AMH, Karri SK, Helmy A, Budohoski KP, Kirollos RW, Bulters DO, Kirkpatrick PJ, Ogilvy CS, Trivedi RA. Pharmacologic Management of Subarachnoid Hemorrhage. World Neurosurg 2015; 84:28-35. [PMID: 25701766 DOI: 10.1016/j.wneu.2015.02.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 01/31/2015] [Accepted: 02/04/2015] [Indexed: 10/24/2022]
Abstract
Subarachnoid hemorrhage (SAH) remains a condition with suboptimal functional outcomes, especially in the young population. Pharmacotherapy has an accepted role in several aspects of the disease and an emerging role in several others. No preventive pharmacologic interventions for SAH currently exist. Antiplatelet medications as well as anticoagulation have been used to prevent thromboembolic events after endovascular coiling. However, the main focus of pharmacologic treatment of SAH is the prevention of delayed cerebral ischemia (DCI). Currently the only evidence-based medical intervention is nimodipine. Other calcium channel blockers have been evaluated without convincing efficacy. Anti-inflammatory drugs such as statins have demonstrated early potential; however, they failed to provide significant evidence for the use in preventing DCI. Similar findings have been reported for magnesium, which showed potential in experimental studies and a phase 2 trial. Clazosentane, a potent endothelin receptor antagonist, did not translate to improve functional outcomes. Various other neuroprotective agents have been used to prevent DCI; however, the results have been, at best inconclusive. The prevention of DCI and improvement in functional outcome remain the goals of pharmacotherapy after the culprit lesion has been treated in aneurysmal SAH. Therefore, further research to elucidate the exact mechanisms by which DCI is propagated is clearly needed. In this article, we review the current pharmacologic approaches that have been evaluated in SAH and highlight the areas in which further research is needed.
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Affiliation(s)
- Adam M H Young
- Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom; Department of Neurosurgery, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts, USA.
| | - Surya K Karri
- Department of Neurosurgery, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Adel Helmy
- Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Karol P Budohoski
- Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Ramez W Kirollos
- Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Diederik O Bulters
- Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Peter J Kirkpatrick
- Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
| | - Christopher S Ogilvy
- Department of Neurosurgery, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Rikin A Trivedi
- Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom
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Walcott BP, Patel AP, Stapleton CJ, Trivedi RA, Young AM, Ogilvy CS. Multiplexed protein profiling after aneurysmal subarachnoid hemorrhage: characterization of differential expression patterns in cerebral vasospasm. J Clin Neurosci 2014; 21:2135-2139. [PMID: 25082408 PMCID: PMC4250356 DOI: 10.1016/j.jocn.2014.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 06/14/2014] [Indexed: 11/19/2022]
Abstract
Cerebral vasospasm is a major contributor to delayed morbidity following aneurysmal subarachnoid hemorrhage. We sought to evaluate differential plasma protein levels across time in patients with aneurysmal subarachnoid hemorrhage to identify potential biomarkers and to better understand the pathogenesis of cerebral vasospasm. Nine female patients with aneurysmal subarachnoid hemorrhage underwent serial analysis of 239 different serum protein levels using quantitative, multiplexed immunoassays (DiscoveryMAP 250+ v2.0, Myriad RBM, Austin, TX, USA) on post-hemorrhage days 0 and 5. A repeated measures analysis of variance determined that mean protein concentration decreased significantly in patients who developed vasospasm versus those who did not for alpha-2-macroglobulin (F [1.00,7.00]=16.33, p=0.005), angiogenin (F [1.00,7.00]=7.65, p=0.028), apolipoprotein A-IV (F [1.00,7.00]=6.308, p=0.040), granulocyte colony-stimulating factor (F [1.00,7.00]=9.08, p=0.020), macrophage-stimulating protein (F [1.00,7.00]=24.21, p=0.002), tetranectin (F [1.00,7.00]=5.46, p<0.039), vascular endothelial growth factor receptor 3 (F [1.00,7.00]=6.94, p=0.034), and significantly increased for vitronectin (F [1.00,7.00]=5.79, p=0.047). These biomarkers may be of value in detecting cerebral vasospasm, possibly aiding in the identification of patients at high-risk prior to neurological deterioration.
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Affiliation(s)
- Brian P. Walcott
- Department of Neurosurgery, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, White Building Room 502, Boston, MA 02114, USA
| | - Anoop P. Patel
- Department of Neurosurgery, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, White Building Room 502, Boston, MA 02114, USA
| | - Christopher J. Stapleton
- Department of Neurosurgery, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, White Building Room 502, Boston, MA 02114, USA
| | - Rikin A. Trivedi
- Department of Neurosurgery, Addenbrooke’s Hospital and the University of Cambridge, Cambridge, UK
| | - Adam M.H. Young
- Department of Neurosurgery, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, White Building Room 502, Boston, MA 02114, USA
- Department of Neurosurgery, Addenbrooke’s Hospital and the University of Cambridge, Cambridge, UK
| | - Christopher S. Ogilvy
- Department of Neurosurgery, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
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Barone DG, Ban VS, Kirollos RW, Trivedi RA, Bulters DO, Ribas GC, Santarius T. Alternative cost-effective method to record 3D intra-operative images: A technical note. Br J Neurosurg 2014; 28:819-20. [DOI: 10.3109/02688697.2014.931348] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Dyson EW, Kolias AG, Burnstein RM, Hutchinson PJA, Garnett MR, Menon DK, Trivedi RA. Neuro-critical care: a valuable placement during foundation and early neurosurgical training. Br J Neurosurg 2014; 28:675-9. [PMID: 24564243 DOI: 10.3109/02688697.2014.887658] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
INTRODUCTION Neurosciences critical care units (NCCUs) present a unique opportunity to junior trainees in neurosurgery as well as foundation trainees looking to gain experience in the management of critically ill patients with neurological conditions. Placements in NCCUs are undertaken in the early years of neurosurgical training or during neurosciences themed foundation programmes. We sought to quantify the educational benefits of such placements from the trainee perspective. METHODS Thirty-two trainees who had undertaken placements at Foundation Year 2 (FY2) to Specialty Trainee Year 3 (ST3) level between August 2009 and April 2013 were invited to take part in an online questionnaire survey. Competence in individual skills was self-rated on a ranked scale from one (never observed) to five (performed unsupervised) both before and after the placement. Trainees were also asked a series of questions pertaining to their ability to manage common neurosurgical conditions, as well as the perceived educational rigour of their placement. RESULTS Twenty-three responses were received. Eighteen responses were from FY2s and seven were from ST1-3 level trainees. Following their placements, 100% of respondents felt better equipped to deal with neurosurgical and neurological emergencies and cranial trauma. Most felt better equipped to manage hydrocephalus (95.7%), polytrauma patients (95.7%), spontaneous intracranial haemorrhage (91.3%) and spinal trauma (82.6%). Significant increases were seen in experience in all practical skills assessed. These included central venous catheterisation (p < 0.001), intracranial pressure (ICP) bolt insertion (p < 0.001), ICP bolt removal (p < 0.001), external ventricular drain (EVD) insertion (p = 0.001) and tapping of EVD for cerebrospinal fluid sample (p < 0.001). CONCLUSION Our results clearly demonstrate the educational benefits of NCCU placements in the early stages of a neurosurgical training programme as well as in the Foundation Programme. This supports the incorporation of a four- to six-month NCCU rotation in early years training as educationally valuable.
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Affiliation(s)
- Edward W Dyson
- Division of Neurosurgery, Addenbrooke's Hospital and University of Cambridge , Cambridge , UK
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Patel K, Guilfoyle MR, Bulters DO, Kirollos RW, Antoun NM, Higgins JNP, Kirkpatrick PJ, Trivedi RA. Recovery of oculomotor nerve palsy secondary to posterior communicating artery aneurysms. Br J Neurosurg 2013; 28:483-7. [DOI: 10.3109/02688697.2013.857007] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Abstract
Local anesthesia is widely used, in isolation or in conjunction with general anesthesia. The authors describe 2 adolescent patients presenting with absent brainstem reflexes and delayed awakening following elective foramen magnum decompression for Chiari Type I malformation. In both cases, neurological deficits were closely associated with the administration of a levobupivacaine field block following wound closure. In the absence of any structural or biochemical abnormalities, and with spontaneous recovery approximating the anesthetic half-life, the authors' observations are consistent with transient brainstem paralysis caused by perioperative local anesthetic infiltration.
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Affiliation(s)
- Alexis J Joannides
- Neurosurgery Unit, Department of Clinical Neurosciences, University of Cambridge and Addenbrooke's Hospital, Cambridge, United Kingdom.
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Alam M, Kolias AG, Trivedi RA. Magnetic resonance imaging of lumbar spine. BMJ 2012; 344:e4010. [PMID: 22695905 DOI: 10.1136/bmj.e4010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Mostayn Alam
- Division of Neurosurgery, Addenbrooke's Hospital, Cambridge University Hospital NHS Foundation Trust, Cambridge CB2 0QQ, UK.
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Hood B, Wolfe SQ, Trivedi RA, Rajadhyaksha C, Green B. Intramedullary abscess of the cervical spinal cord in an otherwise healthy man. World Neurosurg 2011; 76:361.e15-9. [PMID: 21986440 DOI: 10.1016/j.wneu.2010.01.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2009] [Accepted: 01/14/2010] [Indexed: 10/16/2022]
Abstract
BACKGROUND An intramedullary spinal cord abscess is a rare, albeit widely publicized entity. Classically, patients have an acute onset of symptoms with fevers and leukocytosis supporting the diagnosis. We present a case of intramedullary spinal cord without classic history or imaging characteristics in which the diagnosis was made with diffusion weighted magnetic resonance imaging (MRI). CASE DESCRIPTION A 57-year-old physician presented with severe neck and shoulder pain, which progressed over several days to right-sided hemiparesis with dysesthesias. There was no history of fevers, rigors, or illness. A contrast enhanced MRI of the cervical spine revealed an intramedullary lesion centered around C6-T1 that showed peripheral enhancement with gadolinium and edema extending rostrally and caudally. He was then transferred to our institution where the novel application of diffusion weighted MRI of the spinal cord was performed, suggesting an abscess. He then underwent focal laminectomies and biopsy of this lesion with drainage of the necrotic cavity. Intraoperative Gram stain revealed gram-positive cocci, and cultures were sent to the laboratory. After draining the purulent material and completing a course of tailored antibiotics, the patient showed improvement of his neurologic deficit. CONCLUSIONS The use of diffusion weighted imaging in the spine is a novel application of technology that provided an accurate preoperative diagnosis and allowed us to tailor our surgical approach and provide a rapid focal decompression.
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Affiliation(s)
- Brian Hood
- Department of Neurological Surgery and Neuroradiology, University of Miami/Jackson Memorial Hospital, Miami, Florida, USA.
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Wang MY, Cummock MD, Yu Y, Trivedi RA. An analysis of the differences in the acute hospitalization charges following minimally invasive versus open posterior lumbar interbody fusion. J Neurosurg Spine 2010; 12:694-9. [PMID: 20515357 DOI: 10.3171/2009.12.spine09621] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
OBJECT Minimally invasive spine (MIS) procedures are increasingly being recognized as equivalent to open procedures with regard to clinical and radiographic outcomes. These techniques are also believed to result in less pain and disability in the immediate postoperative period. There are, however, little data to assess whether these procedures produce their intended result and even fewer objective data to demonstrate that they are cost effective when compared with open surgery. METHODS The authors performed a retrospective analysis of hospital charges for 1- and 2-level MIS and open posterior interbody fusion for lumbar spondylotic disease, disc degeneration, and spondylolisthesis treated at a single academic medical center. Patients presenting with bilateral neurological symptoms were treated with open surgery, and those with unilateral symptoms were treated with MIS. Overall hospital charges and surgical episode-related charges, length of stay (LOS), and discharge status were obtained from the hospital finance department and adjusted for multi-/single-level surgeries. RESULTS During a 14-month period, 74 patients (mean age 55 years) were treated. The series included 59 single-level operations (75% MIS and 25% open), and 15 2-level surgeries (53% MIS and 47% open). The demographic profile, including age and Charlson Comorbidity Index, were similar between the 4 groups. The mean LOS for patients undergoing single-level surgery was 3.9 and 4.8 days in the MIS and open cases, respectively (p = 0.017). For those undergoing 2-level surgery, the mean LOS was 5.1 for MIS versus 7.1 for open surgery (p = 0.259). With respect to hospital charges, single-level MIS procedures were associated with an average of $70,159 compared with $78,444 for open surgery (p = 0.027). For 2-level surgery, mean charges totalled $87,454 for MIS versus $108,843 for open surgery (p = 0.071). For single-level surgeries, 5 and 20% of patients undergoing MIS and open surgery, respectively, were discharged to inpatient rehabilitation. For 2-level surgeries, the rates were 13 and 29%, respectively. CONCLUSIONS While hospital setting, treatment population, patient selection, and physician expectation play major roles in determining hospital charges and LOS, this pilot study at an academic teaching hospital shows trends for quicker discharge, reduced hospital charges, and lower transfer rates to inpatient rehabilitation with MIS. However, larger multicenter studies are necessary to validate these findings and their relevance across diverse US practice environments.
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Affiliation(s)
- Michael Y Wang
- Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, Florida 33136, USA.
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Trivedi RA, Weerakkody RA, Turner C, Kirkpatrick PJ. Carotid artery stenosis—an evidence-based review of surgical and non-surgical treatments. Br J Neurosurg 2009; 23:387-92. [DOI: 10.1080/02688690902814741] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Howarth S, Li ZY, Trivedi RA, U-King-Im JM, Graves MJ, Kirkpatrick PJ, Gillard JH. Correlation of macrophage location and plaque stress distribution using USPIO-enhanced MRI in a patient with symptomatic severe carotid stenosis: a new insight into risk stratification. Br J Neurosurg 2009; 21:396-8. [PMID: 17676461 DOI: 10.1080/02688690701400775] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
High resolution, USPIO-enhanced MR imaging can be used to identify inflamed atherosclerotic plaque. We report a case of a 79-year-old man with a symptomatic carotid stenosis of 82%. The plaque was retrieved for histology and finite element analysis (FEA) based on the preoperative MR imaging was used to predict maximal Von Mises stress on the plaque. Macrophage location correlated with maximal predicted stresses on the plaque. This supports the hypothesis that macrophages thin the fibrous cap at points of highest stress, leading to an increased risk of plaque rupture and subsequent stroke.
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Affiliation(s)
- Simon Howarth
- Departments of Radiology, Addenbrooke's Hospital and the University of Cambridge, Cambridge, UK
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Tang TY, Howarth SPS, Li ZY, Miller SR, Graves MJ, U-King-Im JM, Trivedi RA, Walsh SR, Brown AP, Kirkpatrick PJ, Gaunt ME, Gillard JH. Correlation of carotid atheromatous plaque inflammation with biomechanical stress: Utility of USPIO enhanced MR imaging and finite element analysis. Atherosclerosis 2008; 196:879-87. [PMID: 17350023 DOI: 10.1016/j.atherosclerosis.2007.02.004] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2006] [Revised: 01/24/2007] [Accepted: 02/05/2007] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The aim of this study was to explore whether there is a relationship between the degree of MR-defined inflammation using ultra small super-paramagnetic iron oxide (USPIO) particles, and biomechanical stress using finite element analysis (FEA) techniques, in carotid atheromatous plaques. METHODS AND RESULTS 18 patients with angiographically proven carotid stenoses underwent multi-sequence MR imaging before and 36 h after USPIO infusion. T(2)(*) weighted images were manually segmented into quadrants and the signal change in each quadrant normalised to adjacent muscle was calculated after USPIO administration. Plaque geometry was obtained from the rest of the multi-sequence dataset and used within a FEA model to predict maximal stress concentration within each slice. Subsequently, a new statistical model was developed to explicitly investigate the form of the relationship between biomechanical stress and signal change. The Spearman's rank correlation coefficient for USPIO enhanced signal change and maximal biomechanical stress was -0.60 (p=0.009). CONCLUSIONS There is an association between biomechanical stress and USPIO enhanced MR-defined inflammation within carotid atheroma, both known risk factors for plaque vulnerability. This underlines the complex interaction between physiological processes and biomechanical mechanisms in the development of carotid atheroma. However, this is preliminary data that will need validation in a larger cohort of patients.
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Affiliation(s)
- T Y Tang
- University Department of Radiology, Cambridge University Hospitals NHS Foundation Trust, Hills Road, Cambridge CB2 2QQ, UK
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Tang TY, Howarth SPS, Miller SR, Graves MJ, U-King-Im JM, Trivedi RA, Li ZY, Walsh SR, Brown AP, Kirkpatrick PJ, Gaunt ME, Gillard JH. Comparison of the inflammatory burden of truly asymptomatic carotid atheroma with atherosclerotic plaques contralateral to symptomatic carotid stenosis: an ultra small superparamagnetic iron oxide enhanced magnetic resonance study. J Neurol Neurosurg Psychiatry 2007; 78:1337-43. [PMID: 17578854 PMCID: PMC2095592 DOI: 10.1136/jnnp.2007.118901] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Inflammation is a recognised risk factor for the vulnerable atherosclerotic plaque. The aim of this study was to explore whether there is a difference in the degree of magnetic resonance (MR) defined inflammation using ultra small superparamagnetic iron oxide (USPIO) particles within carotid atheroma in completely asymptomatic individuals and the asymptomatic carotid stenosis contralateral to the symptomatic side. METHODS 20 symptomatic patients with contralateral disease and 20 completely asymptomatic patients underwent multi-sequence MR imaging before and 36 h after USPIO infusion. Images were manually segmented into quadrants and signal change in each quadrant was calculated following USPIO administration. Mean signal change was compared across all quadrants in the two groups. RESULTS The mean percentage of quadrants showing signal loss was 53% in the contralateral group compared with 31% in completely asymptomatic individuals (p = 0.025). The mean percentages showing enhancement were 44% and 65%, respectively (p = 0.024). The mean signal difference between the two groups was 8.6% (95% CI 1.6% to 15.6%; p = 0.017). CONCLUSIONS Truly asymptomatic plaques seem to demonstrate inflammation but not to the extent of the contralateral asymptomatic stenosis to the symptomatic side. Inflammatory activity may be a significant risk factor in asymptomatic disease.
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Affiliation(s)
- Tjun Y Tang
- University Department of Radiology, Cambridge University Hospitals NHS Foundation Trust, Hills Road, Cambridge CB2 2QQ, UK
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Trivedi RA, Li ZY, U-King-Im J, Graves MJ, Kirkpatrick PJ, Gillard JH. Identifying vulnerable carotid plaques in vivo using high resolution magnetic resonance imaging-based finite element analysis. J Neurosurg 2007; 107:536-42. [PMID: 17886552 DOI: 10.3171/jns-07/09/0536] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Individuals with carotid atherosclerosis develop symptoms following rupture of vulnerable plaques. Biomechanical stresses within this plaque may increase vulnerability to rupture. In this report the authors describe the use of in vivo carotid plaque imaging and computational mechanics to document the magnitude and distribution of intrinsic plaque stresses. METHODS Ten (five symptomatic and five asymptomatic) individuals underwent plaque characterization magnetic resonance (MR) imaging. Plaque geometry and composition were determined by multisequence review. Intrinsic plaque stress profiles were generated from 3D meshes by using finite element computational analysis. Differences in principal (shear) stress between normal and diseased sections of the carotid artery and between symptomatic and asymptomatic plaques were noted. RESULTS There was a significant difference in peak principal stress between diseased and nondiseased segments of the artery (mean difference 537.65 kPa, p < 0.05). Symptomatic plaques had higher mean stresses than asymptomatic plaques (627.6 kPa compared with 370.2 kPa, p = 0.05), which were independent of luminal stenosis and plaque composition. CONCLUSION Significant differences in plaque stress exist between plaques from symptomatic individuals and those from asymptomatic individuals. The MR imaging-based computational analysis may therefore be a useful aid to identification of vulnerable plaques in vivo.
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Affiliation(s)
- Rikin A Trivedi
- University Department of Radiology, Addenbrooke's Hospital, Cambridge, United Kingdom.
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U-King-Im JM, Graves MJ, Cross JJ, Higgins NJ, Wat J, Trivedi RA, Tang T, Howarth SPS, Kirkpatrick PJ, Antoun NM, Gillard JH. Internal Carotid Artery Stenosis: Accuracy of Subjective Visual Impression for Evaluation with Digital Subtraction Angiography and Contrast-enhanced MR Angiography. Radiology 2007; 244:213-22. [PMID: 17507721 DOI: 10.1148/radiol.2441060749] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE To prospectively determine, for both digital subtraction angiography (DSA) and contrast material-enhanced magnetic resonance (MR) angiography, the accuracy of subjective visual impression (SVI) in the evaluation of internal carotid artery (ICA) stenosis, with objective caliper measurements serving as the reference standard. MATERIALS AND METHODS Local ethics committee approval and written informed patient consent were obtained. A total of 142 symptomatic patients (41 women, 101 men; mean age, 70 years; age range, 44-89 years) suspected of having ICA stenosis on the basis of Doppler ultrasonographic findings underwent both DSA and contrast-enhanced MR angiography. With each modality, three independent neuroradiologists who were blinded to other test results first visually estimated and subsequently objectively measured stenoses. Diagnostic accuracy and percentage misclassification for correct categorization of 70%-99% stenosis were calculated for SVI, with objective measurements serving as the reference standard. Interobserver variability was determined with kappa statistics. RESULTS After exclusion of arteries that were unsuitable for measurement, 180 vessels remained for analysis with DSA and 159 vessels remained for analysis with contrast-enhanced MR angiography. With respect to 70%-99% stenosis, SVI was associated with average misclassification of 8.9% for DSA (8.9%, 7.8%, and 10.0% for readers A, B, and C, respectively) and of 11.7% for contrast-enhanced MR angiography (11.3%, 8.8%, and 15.1% for readers A, B, and C, respectively). Negative predictive values were excellent (92.3%-100%). Interobserver variability was higher for SVI (DSA, kappa = 0.62-0.71; contrast-enhanced MR angiography, kappa = 0.57-0.69) than for objective measurements (DSA, kappa = 0.75-0.80; contrast-enhanced MR angiography, kappa = 0.66-0.72). CONCLUSION SVI alone is not recommended for evaluation of ICA stenosis with both DSA and contrast-enhanced MR angiography. SVI may be acceptable as an initial screening tool to exclude the presence of 70%-99% stenosis, but caliper measurements are warranted to confirm the presence of such stenosis.
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Affiliation(s)
- Jean Marie U-King-Im
- University Department of Radiology, Addenbrooke's Hospital, Box 219, Cambridge CB2 2QQ, England
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Trivedi RA, Mallawarachi C, U-King-Im JM, Graves MJ, Horsley J, Goddard MJ, Brown A, Wang L, Kirkpatrick PJ, Brown J, Gillard JH. Identifying inflamed carotid plaques using in vivo USPIO-enhanced MR imaging to label plaque macrophages. Arterioscler Thromb Vasc Biol 2006; 26:1601-6. [PMID: 16627809 DOI: 10.1161/01.atv.0000222920.59760.df] [Citation(s) in RCA: 281] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND Inflammation within atherosclerotic lesions contributes to plaque instability and vulnerability to rupture. We set out to evaluate the use of a macrophage labeling agent to identify carotid plaque inflammation by in vivo magnetic resonance imaging (MRI). METHODS AND RESULTS Thirty patients with symptomatic severe carotid stenosis scheduled for carotid endarterectomy underwent multi-sequence MRI of the carotid bifurcation before and after injection of ultrasmall superparamagnetic particles of iron oxide (USPIOs). USPIO particles accumulated in macrophages in 24 of 30 plaques (80%). Areas of signal intensity reduction, corresponding to USPIO/macrophage-positive histological sections, were visualized in 24 of 27 (89%) patients, with an average reduction in signal intensity induced by the USPIO particles of 24% (range, 3.1% to 60.8%). CONCLUSIONS USPIO-enhanced MRI can identify plaque inflammation in vivo by accumulation of USPIO within macrophages in carotid plaques.
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Affiliation(s)
- Rikin A Trivedi
- University Department of Radiology, Addenbrooke's Hospital, Cambridge, UK.
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Li ZY, Howarth S, Trivedi RA, U-King-Im JM, Graves MJ, Brown A, Wang L, Gillard JH. Stress analysis of carotid plaque rupture based on in vivo high resolution MRI. J Biomech 2006; 39:2611-22. [PMID: 16256124 DOI: 10.1016/j.jbiomech.2005.08.022] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2005] [Accepted: 08/23/2005] [Indexed: 11/21/2022]
Abstract
Atheromatous carotid plaque rupture is responsible for the majority of ischaemic strokes in the developed world. Plaque rupture has been associated with plaque morphology, plaque components' properties, inflammation and local stress concentration. High resolution multi-spectral magnetic resonance imaging (MRI) has allowed the plaque components to be visualized in vivo. This study combined the recent advances in finite element analysis (FEA) and MRI, and performed stress analysis of five vulnerable carotid plaques based on the geometry derived from in vivo MRI. Image segmentation was based on multi-spectral MRI and co-registered with histology for plaque characterization. Plaque fibrous cap, lipid pool and vessel wall were modelled as isotropic, incompressible hyperelastic materials undergoing large deformation under pulse pressure loading. High stress concentrations were predicted at the shoulders and the thinnest fibrous cap regions of the plaque, and the mean maximal stresses were found to be higher in the ruptured plaques (683.3 kPa) than those in the unruptured plaques (226.9 kPa). The effect of the relative stiffness of fibrous cap to lipid pool on the stress within the cap itself was studied. It was shown that larger relative stiffness of fibrous cap to lipid pool resulted in higher stress within the cap. Thus, it is likely that high stress concentrations in vulnerable plaque may cause plaque rupture and lead to acute ischaemic sequelae. A combination of in vivo high resolution MRI and FEA could potentially act as a useful tool to assess plaque vulnerability and risk stratify patients with carotid atheroma.
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Affiliation(s)
- Zhi-Yong Li
- Department of Radiology, Addenbrooke's Hospital and University of Cambridge, Cambridge, CB2 2QQ, United Kingdom.
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U-King-Im JM, Hollingworth W, Trivedi RA, Cross JJ, Higgins NJ, Graves MJ, Gutnikov S, Kirkpatrick PJ, Warburton EA, Antoun NM, Rothwell PM, Gillard JH. Cost-effectiveness of diagnostic strategies prior to carotid endarterectomy. Ann Neurol 2005; 58:506-15. [PMID: 16178014 DOI: 10.1002/ana.20591] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The main objective of this study was to assess the long-term cost-effectiveness of five alternative diagnostic strategies for identification of severe carotid stenosis in recently symptomatic patients. A decision-analytical model with Markov transition states was constructed. Data sources included a prospective study involving 167 patients who had screening Doppler ultrasound (DUS), confirmatory contrast-enhanced magnetic resonance angiography (CEMRA) and confirmatory digital subtraction angiography (DSA), individual patient data from the European Carotid Surgery Trial and other published clinical and cost data. A "selective" strategy, whereby all patients receive DUS and CEMRA (only proceeding to DSA if the CEMRA is positive and the DUS is negative), was most cost-effective. This was both the cheapest imaging and treatment strategy (35,205 dollars per patient) and yielded 6.1590 quality-adjusted life years (QALYs), higher than three alternative imaging strategies. Probabilistic sensitivity analysis demonstrated that there was less than a 10% probability that imaging with either DUS or DSA alone are cost-effective at the conventional 50,000 dollars/QALY threshold. In conclusion, DSA is not cost-effective in the routine diagnostic workup of most patients. DUS, with additional imaging in the form of CEMRA, is recommended, with a strategy of "CEMRA and selective DUS review" being shown to be the optimal imaging strategy.
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Affiliation(s)
- Jean Marie U-King-Im
- Department of Radiology, Addenbrooke's Hospital and the University of Cambridge, Cambridge, United Kingdom
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U-King-Im JM, Li ZY, Trivedi RA, Howarth S, Graves MJ, Kirkpatrick PJ, Gillard JH. Correlation of shear stress with carotid plaque rupture using MRI and finite element analysis. J Neurol 2005; 253:379-81. [PMID: 16133723 DOI: 10.1007/s00415-005-0959-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2005] [Revised: 05/25/2005] [Accepted: 06/03/2005] [Indexed: 11/24/2022]
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Trivedi RA, U-King-Im JM, Graves MJ, Gillard J, Kirkpatrick PJ. Non-Stenotic Ruptured Atherosclerotic Plaque Causing Thrombo-Embolic Stroke. Cerebrovasc Dis 2005; 20:53-5. [PMID: 15980622 DOI: 10.1159/000086424] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2004] [Indexed: 11/19/2022] Open
Affiliation(s)
- Rikin A Trivedi
- University Department of Radiology, Addenbrooke's Hospital, Cambridge, UK.
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U-King-Im JM, Trivedi RA, Graves MJ, Harkness K, Eales H, Joubert I, Koo B, Antoun N, Warburton EA, Gillard JH, Baron JC. Utility of an ultrafast magnetic resonance imaging protocol in recent and semi-recent strokes. J Neurol Neurosurg Psychiatry 2005; 76:1002-5. [PMID: 15965212 PMCID: PMC1739722 DOI: 10.1136/jnnp.2004.046201] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVE To evaluate the technical feasibility of an integrated ultrafast head magnetic resonance (MR) protocol using a sensitivity encoding (SENSE) technique for depicting parenchymal ischaemia and vascular compromise in patients with suspected recent stroke. METHODS 23 patients were evaluated with the ultrafast MR protocol using T2, T1, fluid attenuated inversion recovery (FLAIR), 3D time of flight magnetic resonance angiography (MRA), and diffusion weighted imaging (DWI) sequences. These were compared with routine conventional MR sequences. RESULTS One patient could not tolerate conventional imaging, although imaging using the three minute head SENSE protocol was diagnostic. Both conventional and ultrafast protocols were of similar diagnostic yield in the remaining patients. There were no significant differences in clinical diagnostic quality for the T1, T2, FLAIR, and DWI sequences. One MRA examination was of better quality when SENSE was used, owing to reduced motion artefacts and shorter imaging time. CONCLUSIONS It is possible to undertake a comprehensive MR examination in stroke patients in approximately three to five minutes. Ultrafast imaging may become a useful triage tool before thrombolytic therapy. It may be of particular benefit in patients unable to tolerate longer sequences. Further work is necessary to confirm these findings in hyperacute stroke.
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Affiliation(s)
- J M U-King-Im
- Department of Radiology, Addenbrooke's Hospital and the University of Cambridge, Cambridge CB2 2QQ, UK
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